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59 lines
1.4 KiB
59 lines
1.4 KiB
=pod
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=head1 NAME
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BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment
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operations
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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int BN_zero(BIGNUM *a);
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int BN_one(BIGNUM *a);
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const BIGNUM *BN_value_one(void);
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int BN_set_word(BIGNUM *a, unsigned long w);
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unsigned long BN_get_word(BIGNUM *a);
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=head1 DESCRIPTION
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BN_zero(), BN_one() and BN_set_word() set B<a> to the values 0, 1 and
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B<w> respectively. BN_zero() and BN_one() are macros.
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BN_value_one() returns a B<BIGNUM> constant of value 1. This constant
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is useful for use in comparisons and assignment.
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BN_get_word() returns B<a>, if it can be represented as an unsigned
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long.
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=head1 RETURN VALUES
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BN_get_word() returns the value B<a>, and 0xffffffffL if B<a> cannot
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be represented as an unsigned long.
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BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise.
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BN_value_one() returns the constant.
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=head1 BUGS
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Someone might change the constant.
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If a B<BIGNUM> is equal to 0xffffffffL it can be represented as an
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unsigned long but this value is also returned on error.
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=head1 SEE ALSO
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L<bn(3)|bn(3)>, L<BN_bn2bin(3)|BN_bn2bin(3)>
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=head1 HISTORY
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BN_zero(), BN_one() and BN_set_word() are available in all versions of
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SSLeay and OpenSSL. BN_value_one() and BN_get_word() were added in
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SSLeay 0.8.
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BN_value_one() was changed to return a true const BIGNUM * in OpenSSL
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0.9.7.
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=cut
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